2003 : Microstructural Simulation of Interface soil-inclusion (using distinct element simulations - code PFC of direct shear tests ). The microstructural analysis performed leads to the characterization of the macroscopic interface, an expression of the macroscopic friction angle is proposed as dependent on the interface macro-roughness and on the micro-roughness of particle-plate contacts. Stage of D.E.A at the LaboratoryMA2G. INSA Rennes –France.